Question

The four major moons of the planet $\text{Jupiter}$ were discovered by:

• A. $\text{Hans Lippershey}$
• B. $\text{Galileo Galilei}$
• C. $\text{Giovanni Cassini}$
• D. $\text{Christian Huygens}$

Answer 1

The correct option is B $\text{Galileo Galilei}$

The moons of the planet $\text{Jupiter}$ are called $\text{Jovian Moons}$ or $\text{Iovian Moons}$. Out of them, the four largest moons were discovered using the earliest of the telescopes back in $\text{March},1610$ by $\text{Galileo Galilei}$. For that reason, they are also called $\text{Galilean moons}$ or $\text{Galilean satellites}$.
The four moons are (from the largest to the smallest):

• $\text{Ganymede}$
• $\text{Callisto}$
• $\text{Europa}$
• $\text{Io}$